<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <script src="js/vue.js"></script>
</head>
<body>
    <div id="app">
        {{message}}
    </div>    
    <script>
        var vm = new Vue({

            data: {
                message: 'welcome to vue'
            }
        }).$mount('#app')
        vm.$destroy()
        console.log(vm.message)
    </script>
</body>
</html>